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I saw that one guy already asked this question, but he did not get an answer and I wasn't able to comment his thread. So, hopefully this is allowed. I am wondering about the following problem:

The problem

How does one interpret that seq. and show that it is a martingale?

Alumninou
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  • ... "One guy" got an answer there: http://math.stackexchange.com/questions/1011850/simple-formula-on-x-nk-sum-1-le-i-1-i-k-le-n-y-i-1-cdot – saz Dec 08 '14 at 09:23
  • Thanks, the interpretation of the sequence seems to align with that of my solution. – Alumninou Dec 08 '14 at 11:15

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